blob: 436d73261810bd8ccd7e65a121fdc1556eb67ae9 [file] [log] [blame]
Thomas Gleixner457c8992019-05-19 13:08:55 +01001// SPDX-License-Identifier: GPL-2.0-only
Linus Torvalds1da177e2005-04-16 15:20:36 -07002/*
3 * linux/init/main.c
4 *
5 * Copyright (C) 1991, 1992 Linus Torvalds
6 *
7 * GK 2/5/95 - Changed to support mounting root fs via NFS
8 * Added initrd & change_root: Werner Almesberger & Hans Lermen, Feb '96
9 * Moan early if gcc is old, avoiding bogus kernels - Paul Gortmaker, May '96
Fabian Frederickdd4d9fe2014-08-08 14:23:44 -070010 * Simplified starting of init: Michael A. Griffith <grif@acm.org>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 */
12
Andrew Mortonea676e82013-04-29 16:18:20 -070013#define DEBUG /* Enable initcall_debug */
14
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/types.h>
Paul Gortmaker8a293be2016-07-23 14:01:45 -040016#include <linux/extable.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/module.h>
18#include <linux/proc_fs.h>
Ingo Molnar5c2c5c52017-02-05 14:24:31 +010019#include <linux/binfmts.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/kernel.h>
21#include <linux/syscalls.h>
Ingo Molnar9b5609f2008-02-14 09:41:09 +010022#include <linux/stackprotector.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include <linux/string.h>
24#include <linux/ctype.h>
25#include <linux/delay.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <linux/ioport.h>
27#include <linux/init.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include <linux/initrd.h>
Mike Rapoport57c8a662018-10-30 15:09:49 -070029#include <linux/memblock.h>
Len Brown4a7a16d2009-06-12 20:42:08 -040030#include <linux/acpi.h>
Masami Hiramatsu7684b852020-01-11 01:03:44 +090031#include <linux/bootconfig.h>
Nicolas Pitre0c688612017-04-12 18:37:14 -040032#include <linux/console.h>
Ingo Molnar38b8d202017-02-08 18:51:31 +010033#include <linux/nmi.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include <linux/percpu.h>
35#include <linux/kmod.h>
Masami Hiramatsu82d083a2020-09-10 17:55:05 +090036#include <linux/kprobes.h>
Alexander Potapenko3c206502022-09-15 17:03:51 +020037#include <linux/kmsan.h>
Nick Piggindb64fe02008-10-18 20:27:03 -070038#include <linux/vmalloc.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include <linux/kernel_stat.h>
Rusty Russelld7cd5612006-12-07 02:14:08 +010040#include <linux/start_kernel.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include <linux/security.h>
Jens Axboe3d442232008-06-26 11:21:34 +020042#include <linux/smp.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#include <linux/profile.h>
Alexander Potapenko0ce20dd2021-02-25 17:18:53 -080044#include <linux/kfence.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#include <linux/rcupdate.h>
Frederic Weisbecker8e9c01c2021-04-09 00:38:59 +020046#include <linux/srcu.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070047#include <linux/moduleparam.h>
48#include <linux/kallsyms.h>
Stephen Boyd83cc6fa2021-07-07 18:09:13 -070049#include <linux/buildid.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#include <linux/writeback.h>
51#include <linux/cpu.h>
52#include <linux/cpuset.h>
Paul Menageddbcc7e2007-10-18 23:39:30 -070053#include <linux/cgroup.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070054#include <linux/efi.h>
Thomas Gleixner906568c2007-02-16 01:28:01 -080055#include <linux/tick.h>
Frederic Weisbecker78634062017-10-27 04:42:28 +020056#include <linux/sched/isolation.h>
Andrew Morton6168a702007-02-17 21:22:39 -080057#include <linux/interrupt.h>
Shailabh Nagarc7572492006-07-14 00:24:40 -070058#include <linux/taskstats_kern.h>
Shailabh Nagarca74e922006-07-14 00:24:36 -070059#include <linux/delayacct.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070060#include <linux/unistd.h>
Alexey Dobriyan3ea056c2018-04-10 16:32:36 -070061#include <linux/utsname.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070062#include <linux/rmap.h>
63#include <linux/mempolicy.h>
64#include <linux/key.h>
Ingo Molnar9a11b49a2006-07-03 00:24:33 -070065#include <linux/debug_locks.h>
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -070066#include <linux/debugobjects.h>
Ingo Molnarfbb9ce952006-07-03 00:24:50 -070067#include <linux/lockdep.h>
Catalin Marinas3c7b4e62009-06-11 13:22:39 +010068#include <linux/kmemleak.h>
Daniel Jordanf1b192b2020-06-03 15:59:35 -070069#include <linux/padata.h>
Sukadev Bhattiprolu84d73782006-12-08 02:38:01 -080070#include <linux/pid_namespace.h>
Greg Kroah-Hartman4c002c92019-12-09 20:33:03 +010071#include <linux/device/driver.h>
Eric W. Biederman73c27992007-05-09 02:34:32 -070072#include <linux/kthread.h>
Adrian Bunke6fe6642007-11-09 22:39:39 +010073#include <linux/sched.h>
Ingo Molnar1777e462017-02-05 14:47:12 +010074#include <linux/sched/init.h>
Adrian Bunka1c9eea2008-02-06 01:36:44 -080075#include <linux/signal.h>
Akinobu Mita199f0ca2008-04-29 01:03:13 -070076#include <linux/idr.h>
Jason Wessel0b4b3822010-05-20 21:04:29 -050077#include <linux/kgdb.h>
Steven Rostedt68bf21a2008-08-14 15:45:08 -040078#include <linux/ftrace.h>
Arjan van de Ven22a9d642009-01-07 08:45:46 -080079#include <linux/async.h>
Kay Sievers2b2af542009-04-30 15:23:42 +020080#include <linux/shmem_fs.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090081#include <linux/slab.h>
Peter Zijlstra24a24bb2010-11-17 23:17:33 +010082#include <linux/perf_event.h>
Al Viroa74fb732012-10-10 21:28:25 -040083#include <linux/ptrace.h>
Thomas Gleixneraa8c6242017-12-04 15:07:36 +010084#include <linux/pti.h>
Tejun Heobb813f42013-01-18 14:05:56 -080085#include <linux/blkdev.h>
Pavel Tatashin5d2a4e92018-07-19 16:55:41 -040086#include <linux/sched/clock.h>
Ingo Molnar29930022017-02-08 18:51:36 +010087#include <linux/sched/task.h>
Ingo Molnar68db0cf2017-02-08 18:51:37 +010088#include <linux/sched/task_stack.h>
Frederic Weisbecker65f382f2013-07-11 19:12:32 +020089#include <linux/context_tracking.h>
Theodore Ts'o47d06e52013-09-10 10:52:35 -040090#include <linux/random.h>
Prarit Bhargava7b0b73d2014-06-04 16:12:17 -070091#include <linux/list.h>
Dmitry Kasatkinc9cd2ce2014-11-05 17:01:15 +020092#include <linux/integrity.h>
Al Viroe149ed22014-11-01 10:57:28 -040093#include <linux/proc_ns.h>
Toshi Kani0ddab1d2015-04-14 15:47:20 -070094#include <linux/io.h>
AKASHI Takahiro39290b32016-11-14 15:15:05 +090095#include <linux/cache.h>
Jinbum Park2959a5f2017-02-27 14:30:22 -080096#include <linux/rodata_test.h>
Josh Poimboeuf33352242018-02-20 11:37:51 -060097#include <linux/jump_label.h>
Marco Elverdfd402a2019-11-14 19:02:54 +010098#include <linux/kcsan.h>
Christoph Hellwigeb9d7d32020-07-22 11:14:02 +020099#include <linux/init_syscalls.h>
Vijayanand Jittae1fdc402021-02-25 17:21:27 -0800100#include <linux/stackdepot.h>
GONG, Ruiqi375561b2022-06-29 14:04:23 +0800101#include <linux/randomize_kstack.h>
Eric Dumazet9c1be1932022-02-05 09:01:25 -0800102#include <net/net_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103
104#include <asm/io.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105#include <asm/setup.h>
Andi Kleena9401992005-07-28 21:15:30 -0700106#include <asm/sections.h>
Arjan van de Ven37b73c82006-01-06 00:12:01 -0800107#include <asm/cacheflush.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108
Steven Rostedt (VMware)4ee7c602018-03-23 10:18:03 -0400109#define CREATE_TRACE_POINTS
110#include <trace/events/initcall.h>
111
Brendan Higgins8c0d8842020-08-04 13:47:43 -0700112#include <kunit/test.h>
113
Sam Ravnborgaae5f662007-02-26 16:45:41 +0100114static int kernel_init(void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115
Tejun Heo2ce802f2011-01-20 12:06:35 +0100116/*
117 * Debug helper: via this flag we know that we are in 'early bootup code'
118 * where only the boot processor is running with IRQ disabled. This means
119 * two things - IRQ must not be enabled before the flag is cleared and some
120 * operations which are not allowed with IRQ disabled are allowed while the
121 * flag is set.
122 */
123bool early_boot_irqs_disabled __read_mostly;
124
Paul E. McKenneya6826042009-02-25 18:03:42 -0800125enum system_states system_state __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126EXPORT_SYMBOL(system_state);
127
128/*
129 * Boot command-line arguments
130 */
131#define MAX_INIT_ARGS CONFIG_INIT_ENV_ARG_LIMIT
132#define MAX_INIT_ENVS CONFIG_INIT_ENV_ARG_LIMIT
133
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134/* Default late time init is NULL. archs can override this later. */
Jan Beulichd2e31922009-01-06 14:41:10 -0800135void (*__initdata late_time_init)(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136
Alon Bar-Lev30d7e0d2007-02-12 00:53:52 -0800137/* Untouched command line saved by arch-specific code. */
138char __initdata boot_command_line[COMMAND_LINE_SIZE];
139/* Untouched saved command line (eg. for /proc) */
Alexey Dobriyan941baf62022-09-08 21:21:54 +0300140char *saved_command_line __ro_after_init;
141unsigned int saved_command_line_len __ro_after_init;
Alon Bar-Lev30d7e0d2007-02-12 00:53:52 -0800142/* Command line for parameter parsing */
143static char *static_command_line;
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900144/* Untouched extra command line */
145static char *extra_command_line;
Masami Hiramatsu1319916202020-01-11 01:04:55 +0900146/* Extra init arguments */
147static char *extra_init_args;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
Steven Rostedt (VMware)f61872b2020-02-07 19:07:37 -0500149#ifdef CONFIG_BOOT_CONFIG
150/* Is bootconfig on command line? */
Masami Hiramatsu (Google)caa07082023-02-28 10:01:42 +0900151static bool bootconfig_found;
Masami Hiramatsub66fbbe2021-09-05 00:54:16 +0900152static size_t initargs_offs;
Steven Rostedt (VMware)f61872b2020-02-07 19:07:37 -0500153#else
154# define bootconfig_found false
Masami Hiramatsub66fbbe2021-09-05 00:54:16 +0900155# define initargs_offs 0
Steven Rostedt (VMware)f61872b2020-02-07 19:07:37 -0500156#endif
157
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158static char *execute_command;
Christoph Hellwig916db732020-06-07 09:06:29 +0200159static char *ramdisk_execute_command = "/init";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160
Jan Beulich8b3b2952007-07-15 23:41:07 -0700161/*
Hannes Frederic Sowac4b2c0c2013-10-19 21:48:53 +0200162 * Used to generate warnings if static_key manipulation functions are used
163 * before jump_label_init is called.
164 */
Fabian Frederickdd4d9fe2014-08-08 14:23:44 -0700165bool static_key_initialized __read_mostly;
Hannes Frederic Sowac4b2c0c2013-10-19 21:48:53 +0200166EXPORT_SYMBOL_GPL(static_key_initialized);
167
168/*
Jan Beulich8b3b2952007-07-15 23:41:07 -0700169 * If set, this is an indication to the drivers that reset the underlying
170 * device before going ahead with the initialization otherwise driver might
171 * rely on the BIOS and skip the reset operation.
172 *
173 * This is useful if kernel is booting in an unreliable environment.
Frans Klaverfc454fd2015-02-23 22:05:56 +0100174 * For ex. kdump situation where previous kernel has crashed, BIOS has been
Jan Beulich8b3b2952007-07-15 23:41:07 -0700175 * skipped and devices will be in unknown state.
176 */
177unsigned int reset_devices;
178EXPORT_SYMBOL(reset_devices);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
Vivek Goyal7e962872006-09-27 01:50:44 -0700180static int __init set_reset_devices(char *str)
181{
182 reset_devices = 1;
183 return 1;
184}
185
186__setup("reset_devices", set_reset_devices);
187
Fabian Frederickdd4d9fe2014-08-08 14:23:44 -0700188static const char *argv_init[MAX_INIT_ARGS+2] = { "init", NULL, };
189const char *envp_init[MAX_INIT_ENVS+2] = { "HOME=/", "TERM=linux", NULL, };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190static const char *panic_later, *panic_param;
191
Yaowei Bai31c025b2016-01-20 14:59:27 -0800192static bool __init obsolete_checksetup(char *line)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193{
Rusty Russell914dcaa2010-08-11 23:04:18 -0600194 const struct obs_kernel_param *p;
Yaowei Bai31c025b2016-01-20 14:59:27 -0800195 bool had_early_param = false;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196
197 p = __setup_start;
198 do {
199 int n = strlen(p->str);
Michal Schmidtb1e4d202011-10-10 00:03:37 +0200200 if (parameqn(line, p->str, n)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 if (p->early) {
Rusty Russell33df0d12006-09-26 10:52:32 +0200202 /* Already done in parse_early_param?
203 * (Needs exact match on param part).
204 * Keep iterating, as we can have early
205 * params and __setups of same names 8( */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 if (line[n] == '\0' || line[n] == '=')
Yaowei Bai31c025b2016-01-20 14:59:27 -0800207 had_early_param = true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 } else if (!p->setup_func) {
Andrew Mortonea676e82013-04-29 16:18:20 -0700209 pr_warn("Parameter %s is obsolete, ignored\n",
210 p->str);
Yaowei Bai31c025b2016-01-20 14:59:27 -0800211 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 } else if (p->setup_func(line + n))
Yaowei Bai31c025b2016-01-20 14:59:27 -0800213 return true;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 }
215 p++;
216 } while (p < __setup_end);
Rusty Russell33df0d12006-09-26 10:52:32 +0200217
218 return had_early_param;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219}
220
221/*
222 * This should be approx 2 Bo*oMips to start (note initial shift), and will
223 * still work even if initially too large, it will just take slightly longer
224 */
225unsigned long loops_per_jiffy = (1<<12);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226EXPORT_SYMBOL(loops_per_jiffy);
227
228static int __init debug_kernel(char *str)
229{
Borislav Petkova8fe19e2014-06-04 16:11:46 -0700230 console_loglevel = CONSOLE_LOGLEVEL_DEBUG;
Yinghai Luf6f21c812008-02-08 04:21:58 -0800231 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232}
233
234static int __init quiet_kernel(char *str)
235{
Borislav Petkova8fe19e2014-06-04 16:11:46 -0700236 console_loglevel = CONSOLE_LOGLEVEL_QUIET;
Yinghai Luf6f21c812008-02-08 04:21:58 -0800237 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238}
239
Yinghai Luf6f21c812008-02-08 04:21:58 -0800240early_param("debug", debug_kernel);
241early_param("quiet", quiet_kernel);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242
243static int __init loglevel(char *str)
244{
Alexander Sverdlin808bf292011-09-21 09:51:40 +0200245 int newlevel;
246
247 /*
248 * Only update loglevel value when a correct setting was passed,
249 * to prevent blind crashes (when loglevel being set to 0) that
250 * are quite hard to debug
251 */
252 if (get_option(&str, &newlevel)) {
253 console_loglevel = newlevel;
254 return 0;
255 }
256
257 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258}
259
Yinghai Luf6f21c812008-02-08 04:21:58 -0800260early_param("loglevel", loglevel);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261
Masami Hiramatsude462e52020-04-26 15:53:30 +0900262#ifdef CONFIG_BLK_DEV_INITRD
Masami Hiramatsua2a9d672022-04-06 11:31:19 +0900263static void * __init get_boot_config_from_initrd(size_t *_size)
Masami Hiramatsude462e52020-04-26 15:53:30 +0900264{
265 u32 size, csum;
266 char *data;
267 u32 *hdr;
Masami Hiramatsu50b8a742020-11-13 02:27:31 +0900268 int i;
Masami Hiramatsude462e52020-04-26 15:53:30 +0900269
270 if (!initrd_end)
271 return NULL;
272
273 data = (char *)initrd_end - BOOTCONFIG_MAGIC_LEN;
Masami Hiramatsu50b8a742020-11-13 02:27:31 +0900274 /*
275 * Since Grub may align the size of initrd to 4, we must
276 * check the preceding 3 bytes as well.
277 */
278 for (i = 0; i < 4; i++) {
279 if (!memcmp(data, BOOTCONFIG_MAGIC, BOOTCONFIG_MAGIC_LEN))
280 goto found;
281 data--;
282 }
283 return NULL;
Masami Hiramatsude462e52020-04-26 15:53:30 +0900284
Masami Hiramatsu50b8a742020-11-13 02:27:31 +0900285found:
Masami Hiramatsude462e52020-04-26 15:53:30 +0900286 hdr = (u32 *)(data - 8);
Masami Hiramatsu24aed092020-11-20 11:29:04 +0900287 size = le32_to_cpu(hdr[0]);
288 csum = le32_to_cpu(hdr[1]);
Masami Hiramatsude462e52020-04-26 15:53:30 +0900289
290 data = ((void *)hdr) - size;
291 if ((unsigned long)data < initrd_start) {
292 pr_err("bootconfig size %d is greater than initrd size %ld\n",
293 size, initrd_end - initrd_start);
294 return NULL;
295 }
296
Masami Hiramatsu765b8552022-04-06 11:31:09 +0900297 if (xbc_calc_checksum(data, size) != csum) {
298 pr_err("bootconfig checksum failed\n");
299 return NULL;
300 }
301
Masami Hiramatsude462e52020-04-26 15:53:30 +0900302 /* Remove bootconfig from initramfs/initrd */
303 initrd_end = (unsigned long)data;
304 if (_size)
305 *_size = size;
Masami Hiramatsude462e52020-04-26 15:53:30 +0900306
307 return data;
308}
309#else
Masami Hiramatsua2a9d672022-04-06 11:31:19 +0900310static void * __init get_boot_config_from_initrd(size_t *_size)
Masami Hiramatsude462e52020-04-26 15:53:30 +0900311{
312 return NULL;
313}
314#endif
315
Masami Hiramatsu7684b852020-01-11 01:03:44 +0900316#ifdef CONFIG_BOOT_CONFIG
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900317
Jason Yana27026e2020-09-15 15:03:24 +0800318static char xbc_namebuf[XBC_KEYLEN_MAX] __initdata;
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900319
320#define rest(dst, end) ((end) > (dst) ? (end) - (dst) : 0)
321
322static int __init xbc_snprint_cmdline(char *buf, size_t size,
323 struct xbc_node *root)
324{
325 struct xbc_node *knode, *vnode;
326 char *end = buf + size;
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900327 const char *val;
328 int ret;
329
330 xbc_node_for_each_key_value(root, knode, val) {
331 ret = xbc_node_compose_key_after(root, knode,
332 xbc_namebuf, XBC_KEYLEN_MAX);
333 if (ret < 0)
334 return ret;
335
336 vnode = xbc_node_get_child(knode);
Masami Hiramatsu88b91372020-02-20 21:19:42 +0900337 if (!vnode) {
338 ret = snprintf(buf, rest(buf, end), "%s ", xbc_namebuf);
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900339 if (ret < 0)
340 return ret;
341 buf += ret;
Masami Hiramatsu88b91372020-02-20 21:19:42 +0900342 continue;
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900343 }
Masami Hiramatsu88b91372020-02-20 21:19:42 +0900344 xbc_array_for_each_value(vnode, val) {
345 ret = snprintf(buf, rest(buf, end), "%s=\"%s\" ",
346 xbc_namebuf, val);
347 if (ret < 0)
348 return ret;
349 buf += ret;
350 }
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900351 }
352
353 return buf - (end - size);
354}
355#undef rest
356
357/* Make an extra command line under given key word */
358static char * __init xbc_make_cmdline(const char *key)
359{
360 struct xbc_node *root;
361 char *new_cmdline;
362 int ret, len = 0;
363
364 root = xbc_find_node(key);
365 if (!root)
366 return NULL;
367
368 /* Count required buffer size */
369 len = xbc_snprint_cmdline(NULL, 0, root);
370 if (len <= 0)
371 return NULL;
372
373 new_cmdline = memblock_alloc(len + 1, SMP_CACHE_BYTES);
374 if (!new_cmdline) {
375 pr_err("Failed to allocate memory for extra kernel cmdline.\n");
376 return NULL;
377 }
378
379 ret = xbc_snprint_cmdline(new_cmdline, len + 1, root);
380 if (ret < 0 || ret > len) {
381 pr_err("Failed to print extra kernel cmdline.\n");
Mike Rapoport4421cca02021-11-05 13:43:22 -0700382 memblock_free(new_cmdline, len + 1);
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900383 return NULL;
384 }
385
386 return new_cmdline;
387}
388
Steven Rostedt (VMware)f61872b2020-02-07 19:07:37 -0500389static int __init bootconfig_params(char *param, char *val,
390 const char *unused, void *arg)
391{
392 if (strcmp(param, "bootconfig") == 0) {
393 bootconfig_found = true;
Steven Rostedt (VMware)f61872b2020-02-07 19:07:37 -0500394 }
395 return 0;
396}
397
Masami Hiramatsud0ac5fb2021-08-05 11:10:51 +0900398static int __init warn_bootconfig(char *str)
399{
400 /* The 'bootconfig' has been handled by bootconfig_params(). */
401 return 0;
402}
403
Cao jin2b7d2fe2021-03-11 16:52:13 +0800404static void __init setup_boot_config(void)
Masami Hiramatsu7684b852020-01-11 01:03:44 +0900405{
Steven Rostedt (VMware)f61872b2020-02-07 19:07:37 -0500406 static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata;
Masami Hiramatsua2a9d672022-04-06 11:31:19 +0900407 const char *msg, *data;
408 int pos, ret;
409 size_t size;
410 char *err;
Masami Hiramatsu7684b852020-01-11 01:03:44 +0900411
Masami Hiramatsu611d0a92020-05-11 10:39:24 +0900412 /* Cut out the bootconfig data even if we have no bootconfig option */
Masami Hiramatsu765b8552022-04-06 11:31:09 +0900413 data = get_boot_config_from_initrd(&size);
Masami Hiramatsua2a9d672022-04-06 11:31:19 +0900414 /* If there is no bootconfig in initrd, try embedded one. */
415 if (!data)
416 data = xbc_get_embedded_bootconfig(&size);
Masami Hiramatsude462e52020-04-26 15:53:30 +0900417
Wolfram Sanga1d3a6d2022-08-18 23:01:59 +0200418 strscpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
Masami Hiramatsu477d0842020-08-04 11:52:13 +0900419 err = parse_args("bootconfig", tmp_cmdline, NULL, 0, 0, 0, NULL,
420 bootconfig_params);
Steven Rostedt (VMware)f61872b2020-02-07 19:07:37 -0500421
Masami Hiramatsu (Google)caa07082023-02-28 10:01:42 +0900422 if (IS_ERR(err) || !(bootconfig_found || IS_ENABLED(CONFIG_BOOT_CONFIG_FORCE)))
Masami Hiramatsu7684b852020-01-11 01:03:44 +0900423 return;
424
Masami Hiramatsub66fbbe2021-09-05 00:54:16 +0900425 /* parse_args() stops at the next param of '--' and returns an address */
Masami Hiramatsu477d0842020-08-04 11:52:13 +0900426 if (err)
Masami Hiramatsub66fbbe2021-09-05 00:54:16 +0900427 initargs_offs = err - tmp_cmdline;
Masami Hiramatsu477d0842020-08-04 11:52:13 +0900428
Masami Hiramatsu611d0a92020-05-11 10:39:24 +0900429 if (!data) {
Masami Hiramatsu (Google)caa07082023-02-28 10:01:42 +0900430 /* If user intended to use bootconfig, show an error level message */
431 if (bootconfig_found)
432 pr_err("'bootconfig' found on command line, but no bootconfig found\n");
433 else
434 pr_info("No bootconfig data provided, so skipping bootconfig");
Masami Hiramatsu611d0a92020-05-11 10:39:24 +0900435 return;
436 }
437
Steven Rostedt (VMware)7495e092020-02-04 07:33:53 -0500438 if (size >= XBC_DATA_MAX) {
Masami Hiramatsua2a9d672022-04-06 11:31:19 +0900439 pr_err("bootconfig size %ld greater than max size %d\n",
440 (long)size, XBC_DATA_MAX);
Masami Hiramatsu7684b852020-01-11 01:03:44 +0900441 return;
Steven Rostedt (VMware)7495e092020-02-04 07:33:53 -0500442 }
Masami Hiramatsu7684b852020-01-11 01:03:44 +0900443
Masami Hiramatsubdac5c22021-09-16 15:23:20 +0900444 ret = xbc_init(data, size, &msg, &pos);
Masami Hiramatsu89b74ca2020-03-03 20:24:50 +0900445 if (ret < 0) {
446 if (pos < 0)
447 pr_err("Failed to init bootconfig: %s.\n", msg);
448 else
449 pr_err("Failed to parse bootconfig: %s at %d.\n",
450 msg, pos);
451 } else {
Masami Hiramatsue3062202021-09-16 15:23:29 +0900452 xbc_get_info(&ret, NULL);
Masami Hiramatsua2a9d672022-04-06 11:31:19 +0900453 pr_info("Load bootconfig: %ld bytes %d nodes\n", (long)size, ret);
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900454 /* keys starting with "kernel." are passed via cmdline */
455 extra_command_line = xbc_make_cmdline("kernel");
Masami Hiramatsu1319916202020-01-11 01:04:55 +0900456 /* Also, "init." keys are init arguments */
457 extra_init_args = xbc_make_cmdline("init");
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900458 }
Steven Rostedt (VMware)7495e092020-02-04 07:33:53 -0500459 return;
Masami Hiramatsu7684b852020-01-11 01:03:44 +0900460}
Masami Hiramatsude462e52020-04-26 15:53:30 +0900461
Masami Hiramatsu40caa122021-09-05 00:54:09 +0900462static void __init exit_boot_config(void)
463{
Masami Hiramatsu115d4d02021-09-17 19:02:39 +0900464 xbc_exit();
Masami Hiramatsu40caa122021-09-05 00:54:09 +0900465}
466
467#else /* !CONFIG_BOOT_CONFIG */
Masami Hiramatsude462e52020-04-26 15:53:30 +0900468
Cao jin2b7d2fe2021-03-11 16:52:13 +0800469static void __init setup_boot_config(void)
Masami Hiramatsude462e52020-04-26 15:53:30 +0900470{
471 /* Remove bootconfig data from initrd */
Masami Hiramatsu765b8552022-04-06 11:31:09 +0900472 get_boot_config_from_initrd(NULL);
Masami Hiramatsude462e52020-04-26 15:53:30 +0900473}
Masami Hiramatsud8a953d2020-02-20 21:18:33 +0900474
475static int __init warn_bootconfig(char *str)
476{
Shaokun Zhang36c6aa22020-05-09 16:33:55 +0800477 pr_warn("WARNING: 'bootconfig' found on the kernel command line but CONFIG_BOOT_CONFIG is not set.\n");
Masami Hiramatsud8a953d2020-02-20 21:18:33 +0900478 return 0;
479}
Masami Hiramatsu40caa122021-09-05 00:54:09 +0900480
481#define exit_boot_config() do {} while (0)
482
483#endif /* CONFIG_BOOT_CONFIG */
484
Masami Hiramatsud0ac5fb2021-08-05 11:10:51 +0900485early_param("bootconfig", warn_bootconfig);
Masami Hiramatsu7684b852020-01-11 01:03:44 +0900486
Chris Metcalfa99cd112012-04-06 12:53:50 -0400487/* Change NUL term back to "=", to make "param" the whole string. */
Arvind Sankar7e2762e2020-01-30 22:17:16 -0800488static void __init repair_env_string(char *param, char *val)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 if (val) {
491 /* param=val or param="val"? */
492 if (val == param+strlen(param)+1)
493 val[-1] = '=';
494 else if (val == param+strlen(param)+2) {
495 val[-2] = '=';
496 memmove(val-1, val, strlen(val)+1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 } else
498 BUG();
499 }
Chris Metcalfa99cd112012-04-06 12:53:50 -0400500}
501
Rusty Russell51e158c2014-04-28 11:34:33 +0930502/* Anything after -- gets handed straight to init. */
Luis R. Rodriguezecc86172015-03-30 16:20:03 -0700503static int __init set_init_arg(char *param, char *val,
504 const char *unused, void *arg)
Rusty Russell51e158c2014-04-28 11:34:33 +0930505{
506 unsigned int i;
507
508 if (panic_later)
509 return 0;
510
Arvind Sankar7e2762e2020-01-30 22:17:16 -0800511 repair_env_string(param, val);
Rusty Russell51e158c2014-04-28 11:34:33 +0930512
513 for (i = 0; argv_init[i]; i++) {
514 if (i == MAX_INIT_ARGS) {
515 panic_later = "init";
516 panic_param = param;
517 return 0;
518 }
519 }
520 argv_init[i] = param;
521 return 0;
522}
523
Chris Metcalfa99cd112012-04-06 12:53:50 -0400524/*
525 * Unknown boot options get handed to init, unless they look like
526 * unused parameters (modprobe will find them in /proc/cmdline).
527 */
Luis R. Rodriguezecc86172015-03-30 16:20:03 -0700528static int __init unknown_bootoption(char *param, char *val,
529 const char *unused, void *arg)
Chris Metcalfa99cd112012-04-06 12:53:50 -0400530{
Arvind Sankar283900e2020-01-30 22:17:19 -0800531 size_t len = strlen(param);
532
Arvind Sankar7e2762e2020-01-30 22:17:16 -0800533 repair_env_string(param, val);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534
535 /* Handle obsolete-style parameters */
536 if (obsolete_checksetup(param))
537 return 0;
538
Rusty Russellf066a4f2009-12-01 14:56:44 +1030539 /* Unused module parameter. */
Arvind Sankar283900e2020-01-30 22:17:19 -0800540 if (strnchr(param, len, '.'))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542
543 if (panic_later)
544 return 0;
545
546 if (val) {
547 /* Environment option */
548 unsigned int i;
549 for (i = 0; envp_init[i]; i++) {
550 if (i == MAX_INIT_ENVS) {
Tetsuo Handa499a4582014-01-23 15:54:56 -0800551 panic_later = "env";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 panic_param = param;
553 }
Arvind Sankar283900e2020-01-30 22:17:19 -0800554 if (!strncmp(param, envp_init[i], len+1))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 break;
556 }
557 envp_init[i] = param;
558 } else {
559 /* Command line option */
560 unsigned int i;
561 for (i = 0; argv_init[i]; i++) {
562 if (i == MAX_INIT_ARGS) {
Tetsuo Handa499a4582014-01-23 15:54:56 -0800563 panic_later = "init";
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 panic_param = param;
565 }
566 }
567 argv_init[i] = param;
568 }
569 return 0;
570}
571
572static int __init init_setup(char *str)
573{
574 unsigned int i;
575
576 execute_command = str;
577 /*
578 * In case LILO is going to boot us with default command line,
579 * it prepends "auto" before the whole cmdline which makes
580 * the shell think it should execute a script with such name.
581 * So we ignore all arguments entered _before_ init=... [MJ]
582 */
583 for (i = 1; i < MAX_INIT_ARGS; i++)
584 argv_init[i] = NULL;
585 return 1;
586}
587__setup("init=", init_setup);
588
Olof Johanssonffdfc402005-09-06 15:17:19 -0700589static int __init rdinit_setup(char *str)
590{
591 unsigned int i;
592
593 ramdisk_execute_command = str;
594 /* See "auto" comment in init_setup */
595 for (i = 1; i < MAX_INIT_ARGS; i++)
596 argv_init[i] = NULL;
597 return 1;
598}
599__setup("rdinit=", rdinit_setup);
600
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601#ifndef CONFIG_SMP
Amerigo Wang34db18a02011-03-22 16:34:06 -0700602static const unsigned int setup_max_cpus = NR_CPUS;
Mike Travise0982e92008-03-26 14:23:48 -0700603static inline void setup_nr_cpu_ids(void) { }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604static inline void smp_prepare_cpus(unsigned int maxcpus) { }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605#endif
606
607/*
Alon Bar-Lev30d7e0d2007-02-12 00:53:52 -0800608 * We need to store the untouched command line for future reference.
609 * We also need to store the touched command line since the parameter
610 * parsing is performed in place, and we should allow a component to
611 * store reference of name/value for future reference.
612 */
613static void __init setup_command_line(char *command_line)
614{
Masami Hiramatsu1319916202020-01-11 01:04:55 +0900615 size_t len, xlen = 0, ilen = 0;
Mike Rapoportf5c73102019-03-11 23:30:20 -0700616
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900617 if (extra_command_line)
618 xlen = strlen(extra_command_line);
Masami Hiramatsu1319916202020-01-11 01:04:55 +0900619 if (extra_init_args)
620 ilen = strlen(extra_init_args) + 4; /* for " -- " */
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900621
622 len = xlen + strlen(boot_command_line) + 1;
Mike Rapoportf5c73102019-03-11 23:30:20 -0700623
Masami Hiramatsu1319916202020-01-11 01:04:55 +0900624 saved_command_line = memblock_alloc(len + ilen, SMP_CACHE_BYTES);
Mike Rapoportf5c73102019-03-11 23:30:20 -0700625 if (!saved_command_line)
Masami Hiramatsu1319916202020-01-11 01:04:55 +0900626 panic("%s: Failed to allocate %zu bytes\n", __func__, len + ilen);
Mike Rapoportf5c73102019-03-11 23:30:20 -0700627
628 static_command_line = memblock_alloc(len, SMP_CACHE_BYTES);
629 if (!static_command_line)
630 panic("%s: Failed to allocate %zu bytes\n", __func__, len);
631
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900632 if (xlen) {
633 /*
634 * We have to put extra_command_line before boot command
635 * lines because there could be dashes (separator of init
636 * command line) in the command lines.
637 */
638 strcpy(saved_command_line, extra_command_line);
639 strcpy(static_command_line, extra_command_line);
640 }
641 strcpy(saved_command_line + xlen, boot_command_line);
642 strcpy(static_command_line + xlen, command_line);
Masami Hiramatsu1319916202020-01-11 01:04:55 +0900643
644 if (ilen) {
645 /*
646 * Append supplemental init boot args to saved_command_line
647 * so that user can check what command line options passed
648 * to init.
Masami Hiramatsub66fbbe2021-09-05 00:54:16 +0900649 * The order should always be
650 * " -- "[bootconfig init-param][cmdline init-param]
Masami Hiramatsu1319916202020-01-11 01:04:55 +0900651 */
Masami Hiramatsub66fbbe2021-09-05 00:54:16 +0900652 if (initargs_offs) {
653 len = xlen + initargs_offs;
654 strcpy(saved_command_line + len, extra_init_args);
655 len += ilen - 4; /* strlen(extra_init_args) */
656 strcpy(saved_command_line + len,
657 boot_command_line + initargs_offs - 1);
Steven Rostedt (VMware)f61872b2020-02-07 19:07:37 -0500658 } else {
Masami Hiramatsub66fbbe2021-09-05 00:54:16 +0900659 len = strlen(saved_command_line);
Masami Hiramatsu1319916202020-01-11 01:04:55 +0900660 strcpy(saved_command_line + len, " -- ");
661 len += 4;
Masami Hiramatsub66fbbe2021-09-05 00:54:16 +0900662 strcpy(saved_command_line + len, extra_init_args);
Steven Rostedt (VMware)f61872b2020-02-07 19:07:37 -0500663 }
Masami Hiramatsu1319916202020-01-11 01:04:55 +0900664 }
Alexey Dobriyan941baf62022-09-08 21:21:54 +0300665
666 saved_command_line_len = strlen(saved_command_line);
Alon Bar-Lev30d7e0d2007-02-12 00:53:52 -0800667}
668
669/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670 * We need to finalize in a non-__init function or else race conditions
671 * between the root thread and the init thread may cause start_kernel to
672 * be reaped by free_initmem before the root thread has proceeded to
673 * cpu_idle.
674 *
675 * gcc-3.4 accidentally inlines this function, so use noinline.
676 */
677
Peter Zijlstrab433c3d2010-06-28 16:51:01 +0200678static __initdata DECLARE_COMPLETION(kthreadd_done);
679
Josh Poimboeuf9ea7e6b2023-04-12 16:49:31 -0700680noinline void __ref __noreturn rest_init(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681{
Thomas Gleixner8fb12152017-05-16 20:42:32 +0200682 struct task_struct *tsk;
Eric W. Biederman73c27992007-05-09 02:34:32 -0700683 int pid;
684
Paul E. McKenney7db905e2009-09-02 14:01:24 -0700685 rcu_scheduler_starting();
Peter Zijlstrab433c3d2010-06-28 16:51:01 +0200686 /*
Peter Zijlstra97158562010-06-30 10:37:11 +0200687 * We need to spawn init first so that it obtains pid 1, however
Peter Zijlstrab433c3d2010-06-28 16:51:01 +0200688 * the init task will end up wanting to create kthreads, which, if
689 * we schedule it before we create kthreadd, will OOPS.
690 */
Eric W. Biederman343f4c42022-04-11 11:40:14 -0500691 pid = user_mode_thread(kernel_init, NULL, CLONE_FS);
Thomas Gleixner8fb12152017-05-16 20:42:32 +0200692 /*
693 * Pin init on the boot CPU. Task migration is not properly working
694 * until sched_init_smp() has been run. It will set the allowed
695 * CPUs for init to the non isolated CPUs.
696 */
697 rcu_read_lock();
698 tsk = find_task_by_pid_ns(pid, &init_pid_ns);
Peter Zijlstra15faafc2021-05-31 12:21:13 +0200699 tsk->flags |= PF_NO_SETAFFINITY;
Thomas Gleixner8fb12152017-05-16 20:42:32 +0200700 set_cpus_allowed_ptr(tsk, cpumask_of(smp_processor_id()));
701 rcu_read_unlock();
702
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703 numa_default_policy();
Mike Christiecf587db2023-03-10 16:03:23 -0600704 pid = kernel_thread(kthreadd, NULL, NULL, CLONE_FS | CLONE_FILES);
Paul E. McKenneyd11c5632010-02-22 17:04:50 -0800705 rcu_read_lock();
Pavel Emelyanov5cd20452008-04-30 00:54:24 -0700706 kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns);
Paul E. McKenneyd11c5632010-02-22 17:04:50 -0800707 rcu_read_unlock();
Thomas Gleixner1c3c5ea2017-05-16 20:42:48 +0200708
709 /*
710 * Enable might_sleep() and smp_processor_id() checks.
Thomas Gleixnerc1a280b2019-07-26 23:19:37 +0200711 * They cannot be enabled earlier because with CONFIG_PREEMPTION=y
Thomas Gleixner1c3c5ea2017-05-16 20:42:48 +0200712 * kernel_thread() would trigger might_sleep() splats. With
713 * CONFIG_PREEMPT_VOLUNTARY=y the init task might have scheduled
714 * already, but it's stuck on the kthreadd_done completion.
715 */
716 system_state = SYSTEM_SCHEDULING;
717
Peter Zijlstrab433c3d2010-06-28 16:51:01 +0200718 complete(&kthreadd_done);
Ingo Molnarf340c0d2005-06-28 16:40:42 +0200719
720 /*
721 * The boot idle thread must execute schedule()
Ingo Molnar1df21052007-07-09 18:51:58 +0200722 * at least once to get things moving:
Ingo Molnarf340c0d2005-06-28 16:40:42 +0200723 */
Thomas Gleixnerbd2f5532011-03-21 12:33:18 +0100724 schedule_preempt_disabled();
Nick Piggin5bfb5d62005-11-08 21:39:01 -0800725 /* Call into cpu_idle with preempt disabled */
Thomas Gleixnera1a04ec2013-03-21 22:49:34 +0100726 cpu_startup_entry(CPUHP_ONLINE);
Ingo Molnar1df21052007-07-09 18:51:58 +0200727}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728
729/* Check for early params. */
Luis R. Rodriguezecc86172015-03-30 16:20:03 -0700730static int __init do_early_param(char *param, char *val,
731 const char *unused, void *arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732{
Rusty Russell914dcaa2010-08-11 23:04:18 -0600733 const struct obs_kernel_param *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734
735 for (p = __setup_start; p < __setup_end; p++) {
Michal Schmidtb1e4d202011-10-10 00:03:37 +0200736 if ((p->early && parameq(param, p->str)) ||
Yinghai Lu18a8bd92007-07-15 23:37:59 -0700737 (strcmp(param, "console") == 0 &&
738 strcmp(p->str, "earlycon") == 0)
739 ) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 if (p->setup_func(val) != 0)
Andrew Mortonea676e82013-04-29 16:18:20 -0700741 pr_warn("Malformed early option '%s'\n", param);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 }
743 }
744 /* We accept everything at this stage. */
745 return 0;
746}
747
Magnus Damm13977092009-03-30 14:37:25 -0700748void __init parse_early_options(char *cmdline)
749{
Luis R. Rodriguezecc86172015-03-30 16:20:03 -0700750 parse_args("early options", cmdline, NULL, 0, 0, 0, NULL,
751 do_early_param);
Magnus Damm13977092009-03-30 14:37:25 -0700752}
753
Linus Torvalds1da177e2005-04-16 15:20:36 -0700754/* Arch code calls this early on, or if not, just before other parsing. */
755void __init parse_early_param(void)
756{
Fabian Frederickdd4d9fe2014-08-08 14:23:44 -0700757 static int done __initdata;
758 static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759
760 if (done)
761 return;
762
763 /* All fall through to do_early_param. */
Wolfram Sanga1d3a6d2022-08-18 23:01:59 +0200764 strscpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
Magnus Damm13977092009-03-30 14:37:25 -0700765 parse_early_options(tmp_cmdline);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766 done = 1;
767}
768
Thomas Gleixnere7ff3a42016-12-09 19:29:10 +0100769void __init __weak arch_post_acpi_subsys_init(void) { }
770
Benjamin Herrenschmidt839ad622008-04-18 16:56:18 +1000771void __init __weak smp_setup_processor_id(void)
Andrew Morton033ab7f2006-06-30 01:55:50 -0700772{
773}
774
David Howellseded09c2012-11-02 13:20:42 +0000775# if THREAD_SIZE >= PAGE_SIZE
Linus Torvaldsb235bee2016-06-24 15:09:37 -0700776void __init __weak thread_stack_cache_init(void)
Benjamin Herrenschmidt8c9843e2008-04-18 16:56:15 +1000777{
778}
David Howellseded09c2012-11-02 13:20:42 +0000779#endif
Benjamin Herrenschmidt8c9843e2008-04-18 16:56:15 +1000780
Nadav Amit4fc19702019-04-26 16:22:46 -0700781void __init __weak poking_init(void) { }
782
Mike Rapoport782de702019-09-23 15:35:31 -0700783void __init __weak pgtable_cache_init(void) { }
Nadav Amitcaa841362019-05-04 18:11:24 -0700784
Kefeng Wang8b097882021-09-07 20:16:06 -0700785void __init __weak trap_init(void) { }
786
Steven Rostedt (VMware)4e379582018-03-26 13:31:07 -0400787bool initcall_debug;
788core_param(initcall_debug, initcall_debug, bool, 0644);
Steven Rostedt (VMware)b0dc52f2018-04-06 09:24:25 -0400789
790#ifdef TRACEPOINTS_ENABLED
Steven Rostedt (VMware)4e379582018-03-26 13:31:07 -0400791static void __init initcall_debug_enable(void);
Steven Rostedt (VMware)b0dc52f2018-04-06 09:24:25 -0400792#else
793static inline void initcall_debug_enable(void)
794{
795}
796#endif
Steven Rostedt (VMware)4e379582018-03-26 13:31:07 -0400797
Marco Elver8cb37a52022-01-31 10:05:20 +0100798#ifdef CONFIG_RANDOMIZE_KSTACK_OFFSET
Kees Cook39218ff2021-04-01 16:23:44 -0700799DEFINE_STATIC_KEY_MAYBE_RO(CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT,
800 randomize_kstack_offset);
801DEFINE_PER_CPU(u32, kstack_offset);
802
803static int __init early_randomize_kstack_offset(char *buf)
804{
805 int ret;
806 bool bool_result;
807
808 ret = kstrtobool(buf, &bool_result);
809 if (ret)
810 return ret;
811
812 if (bool_result)
813 static_branch_enable(&randomize_kstack_offset);
814 else
815 static_branch_disable(&randomize_kstack_offset);
816 return 0;
817}
818early_param("randomize_kstack_offset", early_randomize_kstack_offset);
819#endif
820
Josh Poimboeuf9ea7e6b2023-04-12 16:49:31 -0700821void __init __weak __noreturn arch_call_rest_init(void)
Martin Schwidefsky53c99bd62018-08-31 10:42:24 +0200822{
823 rest_init();
824}
825
Andrew Halaney86d19192021-06-30 18:56:28 -0700826static void __init print_unknown_bootoptions(void)
827{
828 char *unknown_options;
829 char *end;
830 const char *const *p;
831 size_t len;
832
833 if (panic_later || (!argv_init[1] && !envp_init[2]))
834 return;
835
836 /*
837 * Determine how many options we have to print out, plus a space
838 * before each
839 */
840 len = 1; /* null terminator */
841 for (p = &argv_init[1]; *p; p++) {
842 len++;
843 len += strlen(*p);
844 }
845 for (p = &envp_init[2]; *p; p++) {
846 len++;
847 len += strlen(*p);
848 }
849
850 unknown_options = memblock_alloc(len, SMP_CACHE_BYTES);
851 if (!unknown_options) {
852 pr_err("%s: Failed to allocate %zu bytes\n",
853 __func__, len);
854 return;
855 }
856 end = unknown_options;
857
858 for (p = &argv_init[1]; *p; p++)
859 end += sprintf(end, " %s", *p);
860 for (p = &envp_init[2]; *p; p++)
861 end += sprintf(end, " %s", *p);
862
Andrew Halaney8bc2b3d2021-11-08 18:34:27 -0800863 /* Start at unknown_options[1] to skip the initial space */
864 pr_notice("Unknown kernel command line parameters \"%s\", will be passed to user space.\n",
865 &unknown_options[1]);
Mike Rapoport4421cca02021-11-05 13:43:22 -0700866 memblock_free(unknown_options, len);
Andrew Halaney86d19192021-06-30 18:56:28 -0700867}
868
ndesaulniers@google.com514ca142023-04-17 15:00:05 -0700869asmlinkage __visible __init __no_sanitize_address __noreturn __no_stack_protector
870void start_kernel(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871{
Fabian Frederickdd4d9fe2014-08-08 14:23:44 -0700872 char *command_line;
873 char *after_dashes;
Andrew Morton033ab7f2006-06-30 01:55:50 -0700874
Aaron Tomlind4311ff2014-09-12 14:16:17 +0100875 set_task_stack_end_magic(&init_task);
Ming Lei73839c52011-11-17 13:34:31 +0800876 smp_setup_processor_id();
Thomas Gleixner3ac7fe52008-04-30 00:55:01 -0700877 debug_objects_early_init();
Stephen Boyd83cc6fa2021-07-07 18:09:13 -0700878 init_vmlinux_build_id();
Ingo Molnar42059422008-02-14 09:44:08 +0100879
Paul Menageddbcc7e2007-10-18 23:39:30 -0700880 cgroup_init_early();
Ingo Molnarfbb9ce952006-07-03 00:24:50 -0700881
882 local_irq_disable();
Tejun Heo2ce802f2011-01-20 12:06:35 +0100883 early_boot_irqs_disabled = true;
Ingo Molnarfbb9ce952006-07-03 00:24:50 -0700884
Viresh Kumar1b3b3b42017-03-23 17:00:05 +0530885 /*
886 * Interrupts are still disabled. Do necessary setups, then
887 * enable them.
888 */
Stas Sergeev44fd2292006-03-23 02:59:44 -0800889 boot_cpu_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890 page_address_init();
Andrew Mortonea676e82013-04-29 16:18:20 -0700891 pr_notice("%s", linux_banner);
Matthew Garrette6b1db92019-08-19 17:17:37 -0700892 early_security_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893 setup_arch(&command_line);
Cao jin2b7d2fe2021-03-11 16:52:13 +0800894 setup_boot_config();
Alon Bar-Lev30d7e0d2007-02-12 00:53:52 -0800895 setup_command_line(command_line);
Mike Travise0982e92008-03-26 14:23:48 -0700896 setup_nr_cpu_ids();
Tejun Heod6647bd2009-07-21 17:11:50 +0900897 setup_per_cpu_areas();
Stas Sergeev44fd2292006-03-23 02:59:44 -0800898 smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */
Linus Torvaldsb5b14042018-08-12 12:19:42 -0700899 boot_cpu_hotplug_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700900
Masami Hiramatsu51887d02020-01-11 01:04:43 +0900901 pr_notice("Kernel command line: %s\n", saved_command_line);
Dan Williams60411862019-04-18 17:50:44 -0700902 /* parameters may set static keys */
903 jump_label_init();
Pekka Enberg83b519e2009-06-10 19:40:04 +0300904 parse_early_param();
Rusty Russell51e158c2014-04-28 11:34:33 +0930905 after_dashes = parse_args("Booting kernel",
906 static_command_line, __start___param,
907 __stop___param - __start___param,
Luis R. Rodriguezecc86172015-03-30 16:20:03 -0700908 -1, -1, NULL, &unknown_bootoption);
Andrew Halaney86d19192021-06-30 18:56:28 -0700909 print_unknown_bootoptions();
Daniel Thompson3438cf52014-11-11 16:29:46 +1030910 if (!IS_ERR_OR_NULL(after_dashes))
Rusty Russell51e158c2014-04-28 11:34:33 +0930911 parse_args("Setting init args", after_dashes, NULL, 0, -1, -1,
Luis R. Rodriguezecc86172015-03-30 16:20:03 -0700912 NULL, set_init_arg);
Masami Hiramatsu1319916202020-01-11 01:04:55 +0900913 if (extra_init_args)
914 parse_args("Setting extra init args", extra_init_args,
915 NULL, 0, -1, -1, NULL, set_init_arg);
Jeremy Fitzhardinge97ce2c82011-10-12 16:17:54 -0700916
Jason A. Donenfeldf6238492022-09-26 17:43:14 +0200917 /* Architectural and non-timekeeping rng init, before allocator init */
918 random_init_early(command_line);
919
Pekka Enberg83b519e2009-06-10 19:40:04 +0300920 /*
921 * These use large bootmem allocations and must precede
Mike Rapoport (IBM)b7ec1bf2023-03-21 19:05:06 +0200922 * initalization of page allocator
Pekka Enberg83b519e2009-06-10 19:40:04 +0300923 */
Mike Travis162a7e72011-05-24 17:13:20 -0700924 setup_log_buf(0);
Pekka Enberg83b519e2009-06-10 19:40:04 +0300925 vfs_caches_init_early();
926 sort_main_extable();
927 trap_init();
Mike Rapoport (IBM)b7ec1bf2023-03-21 19:05:06 +0200928 mm_core_init();
Peter Zijlstra5b93a832022-10-25 21:38:25 +0200929 poking_init();
Steven Rostedt (VMware)f6317182017-03-03 13:43:34 -0500930 ftrace_init();
931
Steven Rostedt (VMware)e725c732017-03-03 13:37:33 -0500932 /* trace_printk can be enabled here */
933 early_trace_init();
934
Linus Torvalds1da177e2005-04-16 15:20:36 -0700935 /*
936 * Set up the scheduler prior starting any interrupts (such as the
937 * timer interrupt). Full topology setup happens at smp_init()
938 * time - but meanwhile we still have a functioning scheduler.
939 */
940 sched_init();
Valentin Schneiderf1a0a372021-05-12 10:46:36 +0100941
Fabian Frederickdd4d9fe2014-08-08 14:23:44 -0700942 if (WARN(!irqs_disabled(),
943 "Interrupts were enabled *very* early, fixing it\n"))
Ard van Breemenc4a68302007-01-05 16:36:19 -0800944 local_irq_disable();
Matthew Wilcox0a835c42016-12-20 10:27:56 -0500945 radix_tree_init();
Liam R. Howlett54a611b2022-09-06 19:48:39 +0000946 maple_tree_init();
Tejun Heo3347fa02016-09-16 15:49:32 -0400947
948 /*
Tal Shorer7d229c62017-11-03 17:27:49 +0200949 * Set up housekeeping before setting up workqueues to allow the unbound
950 * workqueue to take non-housekeeping into account.
951 */
952 housekeeping_init();
953
954 /*
Tejun Heo3347fa02016-09-16 15:49:32 -0400955 * Allow workqueue creation and work item queueing/cancelling
956 * early. Work item execution depends on kthreads and starts after
957 * workqueue_init().
958 */
959 workqueue_init_early();
960
Linus Torvalds1da177e2005-04-16 15:20:36 -0700961 rcu_init();
Steven Rostedt (Red Hat)5f893b22014-12-12 20:05:10 -0500962
Steven Rostedt (VMware)e725c732017-03-03 13:37:33 -0500963 /* Trace events are available after this */
Steven Rostedt (Red Hat)5f893b22014-12-12 20:05:10 -0500964 trace_init();
965
Steven Rostedt (VMware)4e379582018-03-26 13:31:07 -0400966 if (initcall_debug)
967 initcall_debug_enable();
968
Frederic Weisbecker65f382f2013-07-11 19:12:32 +0200969 context_tracking_init();
Yinghai Lu0b8f1ef2008-12-05 18:58:31 -0800970 /* init some links before init_ISA_irqs() */
971 early_irq_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972 init_IRQ();
Thomas Gleixnerad2b1352013-03-05 15:14:05 +0100973 tick_init();
Linus Torvaldsd6dd50e2014-10-13 15:44:12 +0200974 rcu_init_nohz();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975 init_timers();
Frederic Weisbecker8e9c01c2021-04-09 00:38:59 +0200976 srcu_init();
Thomas Gleixnerc0a31322006-01-09 20:52:32 -0800977 hrtimers_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978 softirq_init();
john stultzad596172006-06-26 00:25:06 -0700979 timekeeping_init();
Jason A. Donenfeldfe222a62022-05-05 02:20:22 +0200980 time_init();
Kees Cookd5553522019-04-19 23:27:05 -0400981
Jason A. Donenfeldf6238492022-09-26 17:43:14 +0200982 /* This must be after timekeeping is initialized */
983 random_init();
984
985 /* These make use of the fully initialized rng */
986 kfence_init();
Kees Cookd5553522019-04-19 23:27:05 -0400987 boot_init_stack_canary();
988
Stephane Eranian9e630202013-04-03 14:21:33 +0200989 perf_event_init();
Heiko Carstens93e02812006-07-03 00:24:24 -0700990 profile_init();
Takao Indohd8ad7d12011-03-29 12:35:04 -0400991 call_function_init();
Steven Rostedtf91eb622013-04-29 16:18:18 -0700992 WARN(!irqs_disabled(), "Interrupts were enabled early\n");
Joel Fernandes (Google)c3bc8fd2018-07-30 15:24:23 -0700993
Tejun Heo2ce802f2011-01-20 12:06:35 +0100994 early_boot_irqs_disabled = false;
Heiko Carstens93e02812006-07-03 00:24:24 -0700995 local_irq_enable();
Benjamin Herrenschmidtdcce2842009-06-18 13:24:12 +1000996
Pekka Enberg7e85ee02009-06-12 14:03:06 +0300997 kmem_cache_init_late();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998
999 /*
1000 * HACK ALERT! This is early. We're enabling the console before
1001 * we've done PCI setups etc, and console_init() must be aware of
1002 * this. But we do want output early, in case something goes wrong.
1003 */
1004 console_init();
1005 if (panic_later)
Tetsuo Handa499a4582014-01-23 15:54:56 -08001006 panic("Too many boot %s vars at `%s'", panic_later,
1007 panic_param);
Ingo Molnarfbb9ce952006-07-03 00:24:50 -07001008
Joel Fernandes (Google)c3bc8fd2018-07-30 15:24:23 -07001009 lockdep_init();
Ingo Molnarfbb9ce952006-07-03 00:24:50 -07001010
Ingo Molnar9a11b49a2006-07-03 00:24:33 -07001011 /*
1012 * Need to run this when irqs are enabled, because it wants
1013 * to self-test [hard/soft]-irqs on/off lock inversion bugs
1014 * too:
1015 */
1016 locking_selftest();
1017
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018#ifdef CONFIG_BLK_DEV_INITRD
1019 if (initrd_start && !initrd_below_start_ok &&
Geert Uytterhoevenbd673c72008-07-29 22:33:36 -07001020 page_to_pfn(virt_to_page((void *)initrd_start)) < min_low_pfn) {
Andrew Mortonea676e82013-04-29 16:18:20 -07001021 pr_crit("initrd overwritten (0x%08lx < 0x%08lx) - disabling it.\n",
Geert Uytterhoevenbd673c72008-07-29 22:33:36 -07001022 page_to_pfn(virt_to_page((void *)initrd_start)),
1023 min_low_pfn);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024 initrd_start = 0;
1025 }
1026#endif
Christoph Lametere7c8d5c2005-06-21 17:14:47 -07001027 setup_per_cpu_pageset();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001028 numa_policy_init();
Dou Liyang9c712062017-09-13 17:17:54 +08001029 acpi_early_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030 if (late_time_init)
1031 late_time_init();
Pavel Tatashin857baa82018-07-19 16:55:42 -04001032 sched_clock_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033 calibrate_delay();
Michael Kelleye45e7612023-03-08 18:40:06 -08001034
Thomas Gleixner9df9d2f2023-06-14 01:39:39 +02001035 arch_cpu_finalize_init();
1036
Gargi Sharma95846ec2017-11-17 15:30:30 -08001037 pid_idr_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 anon_vma_init();
Linus Torvalds11520e52012-12-15 15:15:24 -08001039#ifdef CONFIG_X86
Matt Fleming83e68182012-11-14 09:42:35 +00001040 if (efi_enabled(EFI_RUNTIME_SERVICES))
Linus Torvalds11520e52012-12-15 15:15:24 -08001041 efi_enter_virtual_mode();
1042#endif
Linus Torvaldsb235bee2016-06-24 15:09:37 -07001043 thread_stack_cache_init();
David Howellsd84f4f92008-11-14 10:39:23 +11001044 cred_init();
Heinrich Schuchardtff691f62015-04-16 12:47:44 -07001045 fork_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046 proc_caches_init();
Alexey Dobriyan3ea056c2018-04-10 16:32:36 -07001047 uts_ns_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001048 key_init();
1049 security_init();
Jason Wessel0b4b3822010-05-20 21:04:29 -05001050 dbg_late_init();
Eric Dumazet9c1be1932022-02-05 09:01:25 -08001051 net_ns_init();
Mel Gorman4248b0d2015-08-06 15:46:20 -07001052 vfs_caches_init();
Nicholas Piggin62906022016-12-25 13:00:30 +10001053 pagecache_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001054 signals_init();
Alexey Dobriyan0965232032018-04-10 16:34:45 -07001055 seq_file_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 proc_root_init();
Al Viroe149ed22014-11-01 10:57:28 -04001057 nsfs_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058 cpuset_init();
Zefan Li695df212015-03-04 17:09:33 +08001059 cgroup_init();
Shailabh Nagarc7572492006-07-14 00:24:40 -07001060 taskstats_init_early();
Shailabh Nagarca74e922006-07-14 00:24:36 -07001061 delayacct_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062
Rafael J. Wysockib064a8f2015-06-10 01:33:36 +02001063 acpi_subsystem_init();
Thomas Gleixnere7ff3a42016-12-09 19:29:10 +01001064 arch_post_acpi_subsys_init();
Marco Elverdfd402a2019-11-14 19:02:54 +01001065 kcsan_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066
1067 /* Do the rest non-__init'ed, we're now alive */
Martin Schwidefsky53c99bd62018-08-31 10:42:24 +02001068 arch_call_rest_init();
Borislav Petkova9a3ed12020-04-22 18:11:30 +02001069
ndesaulniers@google.comdc1d0552023-04-17 15:00:06 -07001070 /*
1071 * Avoid stack canaries in callers of boot_init_stack_canary for gcc-10
1072 * and older.
1073 */
1074#if !__has_attribute(__no_stack_protector__)
Borislav Petkova9a3ed12020-04-22 18:11:30 +02001075 prevent_tail_call_optimization();
ndesaulniers@google.comdc1d0552023-04-17 15:00:06 -07001076#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077}
1078
Peter Oberparleiterb99b87f72009-06-17 16:28:03 -07001079/* Call all constructor functions linked into the kernel. */
1080static void __init do_ctors(void)
1081{
Johannes Berg55b6f7632021-02-04 18:32:28 -08001082/*
1083 * For UML, the constructors have already been called by the
1084 * normal setup code as it's just a normal ELF binary, so we
1085 * cannot do it again - but we do need CONFIG_CONSTRUCTORS
1086 * even on UML for modules.
1087 */
1088#if defined(CONFIG_CONSTRUCTORS) && !defined(CONFIG_UML)
H Hartley Sweeten196a15b2009-12-14 18:00:18 -08001089 ctor_fn_t *fn = (ctor_fn_t *) __ctors_start;
Peter Oberparleiterb99b87f72009-06-17 16:28:03 -07001090
H Hartley Sweeten196a15b2009-12-14 18:00:18 -08001091 for (; fn < (ctor_fn_t *) __ctors_end; fn++)
1092 (*fn)();
Peter Oberparleiterb99b87f72009-06-17 16:28:03 -07001093#endif
1094}
1095
Prarit Bhargava7b0b73d2014-06-04 16:12:17 -07001096#ifdef CONFIG_KALLSYMS
1097struct blacklist_entry {
1098 struct list_head next;
1099 char *buf;
1100};
1101
1102static __initdata_or_module LIST_HEAD(blacklisted_initcalls);
1103
1104static int __init initcall_blacklist(char *str)
1105{
1106 char *str_entry;
1107 struct blacklist_entry *entry;
1108
1109 /* str argument is a comma-separated list of functions */
1110 do {
1111 str_entry = strsep(&str, ",");
1112 if (str_entry) {
1113 pr_debug("blacklisting initcall %s\n", str_entry);
Mike Rapoport7e1c4e22018-10-30 15:09:57 -07001114 entry = memblock_alloc(sizeof(*entry),
1115 SMP_CACHE_BYTES);
Mike Rapoportf5c73102019-03-11 23:30:20 -07001116 if (!entry)
1117 panic("%s: Failed to allocate %zu bytes\n",
1118 __func__, sizeof(*entry));
Mike Rapoport7e1c4e22018-10-30 15:09:57 -07001119 entry->buf = memblock_alloc(strlen(str_entry) + 1,
1120 SMP_CACHE_BYTES);
Mike Rapoportf5c73102019-03-11 23:30:20 -07001121 if (!entry->buf)
1122 panic("%s: Failed to allocate %zu bytes\n",
1123 __func__, strlen(str_entry) + 1);
Prarit Bhargava7b0b73d2014-06-04 16:12:17 -07001124 strcpy(entry->buf, str_entry);
1125 list_add(&entry->next, &blacklisted_initcalls);
1126 }
1127 } while (str_entry);
1128
Randy Dunlapf9a40b02022-03-23 16:06:14 -07001129 return 1;
Prarit Bhargava7b0b73d2014-06-04 16:12:17 -07001130}
1131
1132static bool __init_or_module initcall_blacklisted(initcall_t fn)
1133{
Prarit Bhargava7b0b73d2014-06-04 16:12:17 -07001134 struct blacklist_entry *entry;
Rasmus Villemoesc8cdd2b2016-05-20 17:04:27 -07001135 char fn_name[KSYM_SYMBOL_LEN];
Rasmus Villemoes0fd5ed82016-06-24 14:50:30 -07001136 unsigned long addr;
Prarit Bhargava7b0b73d2014-06-04 16:12:17 -07001137
Rasmus Villemoesc8cdd2b2016-05-20 17:04:27 -07001138 if (list_empty(&blacklisted_initcalls))
Prarit Bhargava7b0b73d2014-06-04 16:12:17 -07001139 return false;
1140
Rasmus Villemoes0fd5ed82016-06-24 14:50:30 -07001141 addr = (unsigned long) dereference_function_descriptor(fn);
1142 sprint_symbol_no_offset(fn_name, addr);
Rasmus Villemoesc8cdd2b2016-05-20 17:04:27 -07001143
Prarit Bhargava841c06d2016-08-02 14:07:15 -07001144 /*
1145 * fn will be "function_name [module_name]" where [module_name] is not
1146 * displayed for built-in init functions. Strip off the [module_name].
1147 */
1148 strreplace(fn_name, ' ', '\0');
1149
Geliang Tange6fd1fb2016-03-15 14:52:46 -07001150 list_for_each_entry(entry, &blacklisted_initcalls, next) {
Prarit Bhargava7b0b73d2014-06-04 16:12:17 -07001151 if (!strcmp(fn_name, entry->buf)) {
1152 pr_debug("initcall %s blacklisted\n", fn_name);
Prarit Bhargava7b0b73d2014-06-04 16:12:17 -07001153 return true;
1154 }
1155 }
1156
Prarit Bhargava7b0b73d2014-06-04 16:12:17 -07001157 return false;
1158}
1159#else
1160static int __init initcall_blacklist(char *str)
1161{
1162 pr_warn("initcall_blacklist requires CONFIG_KALLSYMS\n");
1163 return 0;
1164}
1165
1166static bool __init_or_module initcall_blacklisted(initcall_t fn)
1167{
1168 return false;
1169}
1170#endif
1171__setup("initcall_blacklist=", initcall_blacklist);
1172
Steven Rostedt (VMware)4e379582018-03-26 13:31:07 -04001173static __init_or_module void
1174trace_initcall_start_cb(void *data, initcall_t fn)
Linus Torvaldse0df1542008-05-15 18:14:01 -07001175{
Zhou jie374d6cd2022-09-28 09:45:39 +08001176 ktime_t *calltime = data;
Linus Torvaldse0df1542008-05-15 18:14:01 -07001177
Geert Uytterhoeven58e2cf52021-09-01 09:09:28 +02001178 printk(KERN_DEBUG "calling %pS @ %i\n", fn, task_pid_nr(current));
Steven Rostedt (VMware)4e379582018-03-26 13:31:07 -04001179 *calltime = ktime_get();
1180}
1181
1182static __init_or_module void
1183trace_initcall_finish_cb(void *data, initcall_t fn, int ret)
1184{
Zhou jie374d6cd2022-09-28 09:45:39 +08001185 ktime_t rettime, *calltime = data;
Steven Rostedt (VMware)4e379582018-03-26 13:31:07 -04001186
Kevin Winchester22c5c032010-08-09 17:20:32 -07001187 rettime = ktime_get();
Geert Uytterhoeven58e2cf52021-09-01 09:09:28 +02001188 printk(KERN_DEBUG "initcall %pS returned %d after %lld usecs\n",
Mark-PK Tsai105e8c22022-03-23 16:06:08 -07001189 fn, ret, (unsigned long long)ktime_us_delta(rettime, *calltime));
Kevin Winchester22c5c032010-08-09 17:20:32 -07001190}
1191
Steven Rostedt (VMware)4e379582018-03-26 13:31:07 -04001192static ktime_t initcall_calltime;
1193
Steven Rostedt (VMware)b0dc52f2018-04-06 09:24:25 -04001194#ifdef TRACEPOINTS_ENABLED
Steven Rostedt (VMware)4e379582018-03-26 13:31:07 -04001195static void __init initcall_debug_enable(void)
1196{
1197 int ret;
1198
1199 ret = register_trace_initcall_start(trace_initcall_start_cb,
1200 &initcall_calltime);
1201 ret |= register_trace_initcall_finish(trace_initcall_finish_cb,
1202 &initcall_calltime);
1203 WARN(ret, "Failed to register initcall tracepoints\n");
Kevin Winchester22c5c032010-08-09 17:20:32 -07001204}
Steven Rostedt (VMware)b0dc52f2018-04-06 09:24:25 -04001205# define do_trace_initcall_start trace_initcall_start
1206# define do_trace_initcall_finish trace_initcall_finish
1207#else
1208static inline void do_trace_initcall_start(initcall_t fn)
1209{
1210 if (!initcall_debug)
1211 return;
1212 trace_initcall_start_cb(&initcall_calltime, fn);
1213}
1214static inline void do_trace_initcall_finish(initcall_t fn, int ret)
1215{
1216 if (!initcall_debug)
1217 return;
1218 trace_initcall_finish_cb(&initcall_calltime, fn, ret);
1219}
1220#endif /* !TRACEPOINTS_ENABLED */
Kevin Winchester22c5c032010-08-09 17:20:32 -07001221
Kevin Winchestere4461272010-08-09 17:20:32 -07001222int __init_or_module do_one_initcall(initcall_t fn)
Kevin Winchester22c5c032010-08-09 17:20:32 -07001223{
1224 int count = preempt_count();
Steven Rostedtff1c8fa2013-07-03 15:05:37 -07001225 char msgbuf[64];
Steven Rostedt (VMware)4e379582018-03-26 13:31:07 -04001226 int ret;
Kevin Winchester22c5c032010-08-09 17:20:32 -07001227
Prarit Bhargava7b0b73d2014-06-04 16:12:17 -07001228 if (initcall_blacklisted(fn))
1229 return -EPERM;
1230
Steven Rostedt (VMware)b0dc52f2018-04-06 09:24:25 -04001231 do_trace_initcall_start(fn);
Steven Rostedt (VMware)4e379582018-03-26 13:31:07 -04001232 ret = fn();
Steven Rostedt (VMware)b0dc52f2018-04-06 09:24:25 -04001233 do_trace_initcall_finish(fn, ret);
Linus Torvaldse0df1542008-05-15 18:14:01 -07001234
1235 msgbuf[0] = 0;
1236
Linus Torvaldse0df1542008-05-15 18:14:01 -07001237 if (preempt_count() != count) {
Steven Rostedtbf5d7702013-05-01 13:35:51 -04001238 sprintf(msgbuf, "preemption imbalance ");
Peter Zijlstra4a2b4b22013-08-14 14:55:24 +02001239 preempt_count_set(count);
Linus Torvaldse0df1542008-05-15 18:14:01 -07001240 }
1241 if (irqs_disabled()) {
Cyrill Gorcunova76bfd02008-05-15 13:52:41 -07001242 strlcat(msgbuf, "disabled interrupts ", sizeof(msgbuf));
Linus Torvaldse0df1542008-05-15 18:14:01 -07001243 local_irq_enable();
1244 }
Sakari Ailusd75f7732019-03-25 21:32:28 +02001245 WARN(msgbuf[0], "initcall %pS returned with %s\n", fn, msgbuf);
Arjan van de Ven59f94152008-07-30 12:49:02 -07001246
Emese Revfy38addce2016-06-20 20:41:19 +02001247 add_latent_entropy();
Américo Wang30dbb20e2010-05-26 18:57:53 +08001248 return ret;
Linus Torvaldse0df1542008-05-15 18:14:01 -07001249}
1250
1251
Ard Biesheuvel1b1eeca2018-08-21 21:56:13 -07001252static initcall_entry_t *initcall_levels[] __initdata = {
Pawel Moll026cee02012-03-26 12:50:51 +10301253 __initcall0_start,
1254 __initcall1_start,
1255 __initcall2_start,
1256 __initcall3_start,
1257 __initcall4_start,
1258 __initcall5_start,
1259 __initcall6_start,
1260 __initcall7_start,
1261 __initcall_end,
1262};
1263
Jim Cromie96263d22012-06-14 16:00:59 -06001264/* Keep these in sync with initcalls in include/linux/init.h */
Alexey Dobriyan7c8f7192019-01-03 15:27:29 -08001265static const char *initcall_level_names[] __initdata = {
Steven Rostedt (VMware)a6fb6012018-03-22 19:28:54 -04001266 "pure",
Jim Cromie9fb48c72012-04-27 14:30:34 -06001267 "core",
1268 "postcore",
1269 "arch",
1270 "subsys",
1271 "fs",
1272 "device",
1273 "late",
Pawel Moll026cee02012-03-26 12:50:51 +10301274};
1275
Arvind Sankar7e2762e2020-01-30 22:17:16 -08001276static int __init ignore_unknown_bootoption(char *param, char *val,
1277 const char *unused, void *arg)
1278{
1279 return 0;
1280}
1281
Masami Hiramatsu0068c922020-01-11 01:04:31 +09001282static void __init do_initcall_level(int level, char *command_line)
Pawel Moll026cee02012-03-26 12:50:51 +10301283{
Ard Biesheuvel1b1eeca2018-08-21 21:56:13 -07001284 initcall_entry_t *fn;
Pawel Moll026cee02012-03-26 12:50:51 +10301285
Pawel Moll026cee02012-03-26 12:50:51 +10301286 parse_args(initcall_level_names[level],
Masami Hiramatsu0068c922020-01-11 01:04:31 +09001287 command_line, __start___param,
Pawel Moll026cee02012-03-26 12:50:51 +10301288 __stop___param - __start___param,
1289 level, level,
Arvind Sankar7e2762e2020-01-30 22:17:16 -08001290 NULL, ignore_unknown_bootoption);
Pawel Moll026cee02012-03-26 12:50:51 +10301291
Steven Rostedt (VMware)4ee7c602018-03-23 10:18:03 -04001292 trace_initcall_level(initcall_level_names[level]);
Pawel Moll026cee02012-03-26 12:50:51 +10301293 for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++)
Ard Biesheuvel1b1eeca2018-08-21 21:56:13 -07001294 do_one_initcall(initcall_from_entry(fn));
Pawel Moll026cee02012-03-26 12:50:51 +10301295}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296
1297static void __init do_initcalls(void)
1298{
Pawel Moll026cee02012-03-26 12:50:51 +10301299 int level;
Alexey Dobriyan941baf62022-09-08 21:21:54 +03001300 size_t len = saved_command_line_len + 1;
Masami Hiramatsu0068c922020-01-11 01:04:31 +09001301 char *command_line;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001302
Masami Hiramatsu0068c922020-01-11 01:04:31 +09001303 command_line = kzalloc(len, GFP_KERNEL);
1304 if (!command_line)
1305 panic("%s: Failed to allocate %zu bytes\n", __func__, len);
1306
1307 for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) {
1308 /* Parser modifies command_line, restore it each time */
1309 strcpy(command_line, saved_command_line);
1310 do_initcall_level(level, command_line);
1311 }
1312
1313 kfree(command_line);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001314}
1315
1316/*
1317 * Ok, the machine is now initialized. None of the devices
1318 * have been touched yet, but the CPU subsystem is up and
1319 * running, and memory and process management works.
1320 *
1321 * Now we can finally start doing some real work..
1322 */
1323static void __init do_basic_setup(void)
1324{
Lai Jiangshan759ee092009-03-25 17:06:30 +08001325 cpuset_init_smp();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001326 driver_init();
Eric W. Biedermanb04c3af2007-02-14 00:33:57 -08001327 init_irq_proc();
Peter Oberparleiterb99b87f72009-06-17 16:28:03 -07001328 do_ctors();
wangyanqingb0f84372011-09-29 15:09:40 +08001329 do_initcalls();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001330}
1331
Eduard - Gabriel Munteanu7babe8d2008-07-25 19:45:11 -07001332static void __init do_pre_smp_initcalls(void)
Eduard - Gabriel Munteanuc2147a52008-07-25 19:45:11 -07001333{
Ard Biesheuvel1b1eeca2018-08-21 21:56:13 -07001334 initcall_entry_t *fn;
Eduard - Gabriel Munteanuc2147a52008-07-25 19:45:11 -07001335
Steven Rostedt (VMware)4ee7c602018-03-23 10:18:03 -04001336 trace_initcall_level("early");
Pawel Moll026cee02012-03-26 12:50:51 +10301337 for (fn = __initcall_start; fn < __initcall0_start; fn++)
Ard Biesheuvel1b1eeca2018-08-21 21:56:13 -07001338 do_one_initcall(initcall_from_entry(fn));
Eduard - Gabriel Munteanuc2147a52008-07-25 19:45:11 -07001339}
1340
Al Viroa74fb732012-10-10 21:28:25 -04001341static int run_init_process(const char *init_filename)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001342{
Arvind Sankarb88c50a2020-01-30 22:17:13 -08001343 const char *const *p;
1344
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345 argv_init[0] = init_filename;
Paul Menzel3f5c15d2018-08-21 21:58:37 -07001346 pr_info("Run %s as init process\n", init_filename);
Arvind Sankarb88c50a2020-01-30 22:17:13 -08001347 pr_debug(" with arguments:\n");
1348 for (p = argv_init; *p; p++)
1349 pr_debug(" %s\n", *p);
1350 pr_debug(" with environment:\n");
1351 for (p = envp_init; *p; p++)
1352 pr_debug(" %s\n", *p);
Eric W. Biedermanbe619f72020-07-13 12:06:48 -05001353 return kernel_execve(init_filename, argv_init, envp_init);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354}
1355
Michael Opdenackerba247622013-11-12 15:10:21 -08001356static int try_to_run_init_process(const char *init_filename)
1357{
1358 int ret;
1359
1360 ret = run_init_process(init_filename);
1361
1362 if (ret && ret != -ENOENT) {
1363 pr_err("Starting init: %s exists but couldn't execute it (error %d)\n",
1364 init_filename, ret);
1365 }
1366
1367 return ret;
1368}
1369
Vineet Guptaf80b0c92012-12-21 12:25:44 +05301370static noinline void __init kernel_init_freeable(void);
Al Virod6b21232012-10-10 19:57:26 -04001371
Laura Abbott0f5bf6d2017-02-06 16:31:58 -08001372#if defined(CONFIG_STRICT_KERNEL_RWX) || defined(CONFIG_STRICT_MODULE_RWX)
AKASHI Takahiro39290b32016-11-14 15:15:05 +09001373bool rodata_enabled __ro_after_init = true;
Mark Rutland2e8cff02022-08-17 16:40:22 +01001374
1375#ifndef arch_parse_debug_rodata
1376static inline bool arch_parse_debug_rodata(char *str) { return false; }
1377#endif
1378
Kees Cookd2aa1ac2016-02-17 14:41:13 -08001379static int __init set_debug_rodata(char *str)
1380{
Mark Rutland2e8cff02022-08-17 16:40:22 +01001381 if (arch_parse_debug_rodata(str))
1382 return 0;
1383
1384 if (str && !strcmp(str, "on"))
1385 rodata_enabled = true;
1386 else if (str && !strcmp(str, "off"))
1387 rodata_enabled = false;
1388 else
Randy Dunlapf9a40b02022-03-23 16:06:14 -07001389 pr_warn("Invalid option string for rodata: '%s'\n", str);
Mark Rutland2e8cff02022-08-17 16:40:22 +01001390 return 0;
Kees Cookd2aa1ac2016-02-17 14:41:13 -08001391}
Mark Rutland2e8cff02022-08-17 16:40:22 +01001392early_param("rodata", set_debug_rodata);
AKASHI Takahiro39290b32016-11-14 15:15:05 +09001393#endif
Kees Cookd2aa1ac2016-02-17 14:41:13 -08001394
Laura Abbott0f5bf6d2017-02-06 16:31:58 -08001395#ifdef CONFIG_STRICT_KERNEL_RWX
Kees Cookd2aa1ac2016-02-17 14:41:13 -08001396static void mark_readonly(void)
1397{
Jinbum Park2959a5f2017-02-27 14:30:22 -08001398 if (rodata_enabled) {
Jeffrey Hugoae646f02018-05-11 16:01:42 -07001399 /*
Paul E. McKenneyba180312018-11-06 18:58:01 -08001400 * load_module() results in W+X mappings, which are cleaned
1401 * up with call_rcu(). Let's make sure that queued work is
Jeffrey Hugoae646f02018-05-11 16:01:42 -07001402 * flushed so that we don't hit false positives looking for
1403 * insecure pages which are W+X.
1404 */
Paul E. McKenneyba180312018-11-06 18:58:01 -08001405 rcu_barrier();
Kees Cookd2aa1ac2016-02-17 14:41:13 -08001406 mark_rodata_ro();
Jinbum Park2959a5f2017-02-27 14:30:22 -08001407 rodata_test();
1408 } else
Kees Cookd2aa1ac2016-02-17 14:41:13 -08001409 pr_info("Kernel memory protection disabled.\n");
1410}
Christophe Leroyf596ded12020-01-30 22:17:23 -08001411#elif defined(CONFIG_ARCH_HAS_STRICT_KERNEL_RWX)
1412static inline void mark_readonly(void)
1413{
1414 pr_warn("Kernel memory protection not selected by kernel config.\n");
1415}
Kees Cookd2aa1ac2016-02-17 14:41:13 -08001416#else
1417static inline void mark_readonly(void)
1418{
1419 pr_warn("This architecture does not have kernel memory protection.\n");
1420}
1421#endif
1422
Mike Rapoport997aef62019-05-13 17:18:40 -07001423void __weak free_initmem(void)
1424{
Mike Rapoportf4039992019-05-13 17:18:46 -07001425 free_initmem_default(POISON_FREE_INITMEM);
Mike Rapoport997aef62019-05-13 17:18:40 -07001426}
1427
Al Virod6b21232012-10-10 19:57:26 -04001428static int __ref kernel_init(void *unused)
Vivek Goyalee5bfa62007-02-13 13:26:22 +01001429{
Michael Opdenackerba247622013-11-12 15:10:21 -08001430 int ret;
1431
Peter Zijlstra15faafc2021-05-31 12:21:13 +02001432 /*
1433 * Wait until kthreadd is all set-up.
1434 */
1435 wait_for_completion(&kthreadd_done);
1436
Al Virod6b21232012-10-10 19:57:26 -04001437 kernel_init_freeable();
Arjan van de Ven22a9d642009-01-07 08:45:46 -08001438 /* need to finish all async __init code before freeing the memory */
1439 async_synchronize_full();
Christophe Leroyd2635f22021-11-05 13:40:40 -07001440
1441 system_state = SYSTEM_FREEING_INITMEM;
Masami Hiramatsu82d083a2020-09-10 17:55:05 +09001442 kprobe_free_init_mem();
Steven Rostedt (VMware)b80f0f62017-04-03 12:57:35 -04001443 ftrace_free_init_mem();
Sumit Gargd54ce612021-02-25 17:22:38 -08001444 kgdb_free_init_mem();
Masami Hiramatsu40caa122021-09-05 00:54:09 +09001445 exit_boot_config();
Vivek Goyalee5bfa62007-02-13 13:26:22 +01001446 free_initmem();
Kees Cookd2aa1ac2016-02-17 14:41:13 -08001447 mark_readonly();
Joerg Roedelb9766902018-07-18 11:41:06 +02001448
1449 /*
1450 * Kernel mappings are now finalized - update the userspace page-table
1451 * to finalize PTI.
1452 */
1453 pti_finalize();
1454
Vivek Goyalee5bfa62007-02-13 13:26:22 +01001455 system_state = SYSTEM_RUNNING;
1456 numa_default_policy();
1457
Paul E. McKenney967dcb82015-11-25 16:52:36 -08001458 rcu_end_inkernel_boot();
1459
Vlastimil Babka3db978d2020-06-07 21:40:24 -07001460 do_sysctl_args();
1461
Vivek Goyalee5bfa62007-02-13 13:26:22 +01001462 if (ramdisk_execute_command) {
Michael Opdenackerba247622013-11-12 15:10:21 -08001463 ret = run_init_process(ramdisk_execute_command);
1464 if (!ret)
Al Viroa74fb732012-10-10 21:28:25 -04001465 return 0;
Michael Opdenackerba247622013-11-12 15:10:21 -08001466 pr_err("Failed to execute %s (error %d)\n",
1467 ramdisk_execute_command, ret);
Vivek Goyalee5bfa62007-02-13 13:26:22 +01001468 }
1469
1470 /*
1471 * We try each of these until one succeeds.
1472 *
1473 * The Bourne shell can be used instead of init if we are
1474 * trying to recover a really broken machine.
1475 */
1476 if (execute_command) {
Michael Opdenackerba247622013-11-12 15:10:21 -08001477 ret = run_init_process(execute_command);
1478 if (!ret)
Al Viroa74fb732012-10-10 21:28:25 -04001479 return 0;
Andy Lutomirski6ef45362014-12-10 15:52:19 -08001480 panic("Requested init %s failed (error %d).",
1481 execute_command, ret);
Vivek Goyalee5bfa62007-02-13 13:26:22 +01001482 }
Chris Downada4ab72020-06-04 16:50:53 -07001483
1484 if (CONFIG_DEFAULT_INIT[0] != '\0') {
1485 ret = run_init_process(CONFIG_DEFAULT_INIT);
1486 if (ret)
1487 pr_err("Default init %s failed (error %d)\n",
1488 CONFIG_DEFAULT_INIT, ret);
1489 else
1490 return 0;
1491 }
1492
Michael Opdenackerba247622013-11-12 15:10:21 -08001493 if (!try_to_run_init_process("/sbin/init") ||
1494 !try_to_run_init_process("/etc/init") ||
1495 !try_to_run_init_process("/bin/init") ||
1496 !try_to_run_init_process("/bin/sh"))
Al Viroa74fb732012-10-10 21:28:25 -04001497 return 0;
Vivek Goyalee5bfa62007-02-13 13:26:22 +01001498
Michael Opdenackerba247622013-11-12 15:10:21 -08001499 panic("No working init found. Try passing init= option to kernel. "
Mauro Carvalho Chehab8c27ceff32016-10-18 10:12:27 -02001500 "See Linux Documentation/admin-guide/init.rst for guidance.");
Vivek Goyalee5bfa62007-02-13 13:26:22 +01001501}
1502
Christoph Hellwig8f740632020-06-07 17:44:28 +02001503/* Open /dev/console, for stdin/stdout/stderr, this should never fail */
Christoph Hellwiga94b5212020-07-28 18:23:21 +02001504void __init console_on_rootfs(void)
Dominik Brodowskib49a7332018-10-23 16:00:10 +02001505{
Christoph Hellwig8f740632020-06-07 17:44:28 +02001506 struct file *file = filp_open("/dev/console", O_RDWR, 0);
Dominik Brodowskib49a7332018-10-23 16:00:10 +02001507
Christoph Hellwig8f740632020-06-07 17:44:28 +02001508 if (IS_ERR(file)) {
Petr Mladeka91bd622021-01-08 12:48:47 +01001509 pr_err("Warning: unable to open an initial console.\n");
1510 return;
Christoph Hellwig8f740632020-06-07 17:44:28 +02001511 }
Christoph Hellwigf0735312020-07-28 17:49:47 +02001512 init_dup(file);
1513 init_dup(file);
1514 init_dup(file);
1515 fput(file);
Dominik Brodowskib49a7332018-10-23 16:00:10 +02001516}
1517
Vineet Guptaf80b0c92012-12-21 12:25:44 +05301518static noinline void __init kernel_init_freeable(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001519{
Linus Torvalds31a67102012-05-21 12:52:42 -07001520 /* Now the scheduler is fully set up and can do blocking allocations */
1521 gfp_allowed_mask = __GFP_BITS_MASK;
1522
Miao Xie58568d22009-06-16 15:31:49 -07001523 /*
1524 * init can allocate pages on any node
1525 */
Lai Jiangshan3c466d42012-12-12 13:51:40 -08001526 set_mems_allowed(node_states[N_MEMORY]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001527
Mark Rutland0711f0d2021-06-04 20:01:14 -07001528 cad_pid = get_pid(task_pid(current));
Cedric Le Goater9ec52092006-10-02 02:19:00 -07001529
Andi Kleenca74a6f2008-01-30 13:33:17 +01001530 smp_prepare_cpus(setup_max_cpus);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001531
Tejun Heo3347fa02016-09-16 15:49:32 -04001532 workqueue_init();
1533
Michal Hocko597b7302017-03-31 15:11:47 -07001534 init_mm_internals();
1535
Uladzislau Rezki (Sony)1b04fa92020-12-09 21:27:31 +01001536 rcu_init_tasks_generic();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001537 do_pre_smp_initcalls();
Peter Zijlstra004417a2010-11-25 18:38:29 +01001538 lockup_detector_init();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001539
Linus Torvalds1da177e2005-04-16 15:20:36 -07001540 smp_init();
1541 sched_init_smp();
1542
Tejun Heo29301552023-08-07 15:57:24 -10001543 workqueue_init_topology();
Daniel Jordanf1b192b2020-06-03 15:59:35 -07001544 padata_init();
Mel Gorman0e1cc952015-06-30 14:57:27 -07001545 page_alloc_init_late();
1546
Linus Torvalds1da177e2005-04-16 15:20:36 -07001547 do_basic_setup();
1548
Brendan Higgins8c0d8842020-08-04 13:47:43 -07001549 kunit_run_all_tests();
1550
Rasmus Villemoese7cb0722021-05-06 18:05:42 -07001551 wait_for_initramfs();
Dominik Brodowskib49a7332018-10-23 16:00:10 +02001552 console_on_rootfs();
Eric W. Biederman2bd3a9972010-03-02 23:53:19 -08001553
Linus Torvalds1da177e2005-04-16 15:20:36 -07001554 /*
1555 * check if there is an early userspace init. If yes, let it do all
1556 * the work
1557 */
Christoph Hellwigeb9d7d32020-07-22 11:14:02 +02001558 if (init_eaccess(ramdisk_execute_command) != 0) {
Olof Johanssonffdfc402005-09-06 15:17:19 -07001559 ramdisk_execute_command = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001560 prepare_namespace();
Olof Johanssonffdfc402005-09-06 15:17:19 -07001561 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001562
1563 /*
1564 * Ok, we have completed the initial bootup, and
1565 * we're essentially up and running. Get rid of the
1566 * initmem segments and start the user-mode stuff..
Dmitry Kasatkinc9cd2ce2014-11-05 17:01:15 +02001567 *
1568 * rootfs is available now, try loading the public keys
1569 * and default modules
Linus Torvalds1da177e2005-04-16 15:20:36 -07001570 */
Tejun Heobb813f42013-01-18 14:05:56 -08001571
Dmitry Kasatkinc9cd2ce2014-11-05 17:01:15 +02001572 integrity_load_keys();
Linus Torvalds1da177e2005-04-16 15:20:36 -07001573}